The motor stock is about 276, now the us version of this motor was about 320. The difference is the cam and the inj, the us spec came with 550 cc and the jdm came with 440cc primarly because the motor was in a luxury car. But all u have to do is swap em out and with few more additions u can easily be at 400 to da wheels on the stock set up.
If I understand what I saw on the video the guy was still on stock everything except went to a single Turbo and was pushing 457 to the rear wheels?
He also speaks of tuning... can the factory ECM be tuned or does it require after market fuel management?